Surface adhesion type overcurrent protection element

A technology of protection components and surface adhesion, which is applied in the field of surface adhesion type overcurrent protection components, can solve problems such as difficulty in carrying current, and achieve the effect of high carrying current and low resistance carrying current

Active Publication Date: 2011-11-23
POLYTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the size of SMD1812, it is difficult for a single-layer PTC layer to reach a carrying current of 1.8A for an overcurrent protection component that uses carbon black as a conductive filler.

Method used

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  • Surface adhesion type overcurrent protection element
  • Surface adhesion type overcurrent protection element
  • Surface adhesion type overcurrent protection element

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Experimental program
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Embodiment Construction

[0018] The structure, composition and manufacturing process of each embodiment of the overcurrent protection element of the present invention will be described below with reference to the accompanying drawings.

[0019] figure 1 It is a schematic diagram of a surface mount overcurrent protection device 1 according to the first embodiment of the present invention, which is used for sticking to the surface of a substrate (not shown). The first metal electrode 13 and the second metal electrode 13' corresponding to the first metal electrode 13 are generally located on the same plane. The surface mount type overcurrent protection element 1 can be designed to only include a set of electrode groups consisting of a first metal electrode 13 and a second metal electrode 13', so that the surface mount type overcurrent protection element 1 can only have one A specific face is bonded to the substrate surface. This design is usually used in narrow spaces, and needs to achieve unidirectio...

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Abstract

The present invention relates to a surface-adhesion type of over-current protection element comprising a first metal foil sheet, a second metal foil sheet opposite to the first one, a PTC material layer set between two foil sheets, a first metal electrode, a metal conductor being electric-connected to the first metal foil sheet and the first metal electrode, a second metal electrode opposite to the first one, a second metal conductor being electric-connected to the second metal foil sheet and the second metal electrode, and at least one insulation layer for isolating the first metal electrode from the second one. The over-current protection element provided by the present invention has the characteristic at the temperature of 25DEG that (the load bearing current) / (covering area * number of PTC material layers) is greater than 0.16A / mm<2>.

Description

technical field [0001] The present invention relates to a surface mount overcurrent protection element, more specifically, to a surface mount overcurrent protection element with small covering area, high carrying current and positive temperature coefficient (positive temperature coefficient; PTC) characteristics. Background technique [0002] Because the resistance of the PTC conductive composite material can maintain an extremely low value at normal temperature, the circuit or battery connected to it can operate normally. However, when an over-current or over-temperature phenomenon occurs in the circuit or battery, its resistance value will instantly increase to a high resistance state (at least 10 4 ohm), and the excess current is counteracted. [0003] Since the resistance of conductive composite materials with PTC characteristics has the above-mentioned characteristics of being sensitive to temperature changes, it can be used as a material for current sensing elements, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01C7/02H01C7/13
Inventor 王绍裘朱复华
Owner POLYTRONICS TECH
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